Faster evolution is a hallmark of the GSX-R1000's engine. And 2012 brings another quick step ahead. Reaffirming the legendary motorcycle's claim to the top are improved throttle response, increased power and acceleration at mid-range engine speeds, and better fuel economy. Refinements ranging from a new stainless steel 4-2-1 exhaust system to completely redesigned pistons. The chassis, suspension and braking systems have also been refined for enhanced performance resulting in a reduction in weight of over four pounds.